Apparatus for purifying benzol.



H. KOPPERS.

APPARATUS FOR PURIFYING BENZOL.

APPLICATION FILED SEPT.2. I913.

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JPatented 001;. 26, 1915.

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HEINRICH KOPPEBS, 01E ESSEN-ON-THE-RUHR, GERMANY, ASSIGNOR TO H. KOPPERS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION.

APPARATUS FOR PURIFYING BENZOL.

Application filed September 2, 1913.

To all whom it may concern:

Be it known that I, HEINRICH Korrnns, a subject of the German Emperor, residing at Essen'on-theRuhr, in Germany, have invented certain new and useful Improvements in Apparatus for Purifying Benzol, of which the following is a specification.

This invention relates to a mixing apparatus for purifying benzol by means of sulfuric acid, and its object is to prevent the centrifugal mixing wheel from being attacked by the acid when the latter, owing to its greater specific weight has settled at the bottom of the mixing apparatus when the latter is out of operation.

This is effected, according to the invention, by arranging the centrifugal wheel at such a height in the mixing vessel that only its depending suction pipe is in contact with the acid when the apparatus is out of use. The suction pipe, by virtue of its simple shape, is less liable than the centrifugal wheel to be attacked by the acid, and on the other hand it can be readily renewed, when necessary, at a small cost. The suction pipe is preferably arranged so that it does not rotate with the centrifugal wheel, as its accurate guidance is otherwise difiicult to accomplish, and the provision of another bearing not desirable for the reasons above mentioned.

4 For this reason the suction pipe is carried by a frame fixed to the casing of the apparatus, so that it remains stationary dur ing the rotation of the centrifugal wheel, and a small gap is left between the top of the suction pipe and the centrifugal wheel, which provides for free relative movement and at the same time furnishes a sufiiciently effective joint.

An embodiment of the invention is shown in cross-section in the accompanying drawmg.

The centrifugal wheel 7) is arranged in the upper part of the closed vessel a and is carr-ied by a bearing bracket 0 and driven by bevel gears d. The bracket 6, fixed to the cover of the vessel a, carries the suction pipe 7, which has a flared upper end 7 fitting with a slight clearance against the centrif Specification of Letters Patent.

Patented (lot. 218, 1915.

Serial No. 787,832.

ugal wheel, the other end of said pipe 7 extending down almost to the bottom of the vessel a. The suction pipe is preferably built up of a number of sections.

When the apparatus is in operation the centrifugal wheel sucks up the acid accumulated at the bottom of the vessel, and mixes it intimately with the benzol above, the suction pipe remaining stationary. \Vhen the apparatus is not in operation, the acid settles at the bottom of the vessel, so that the centrifugal wheel is removed from the action of the acid, only the suction pipe being immersed in the latter. The suction pipe can be readily detached when necessary this being facilitated by reason of it being a stationary part.

The bracket e, which carries the suction pipe, prevents the whole of the liquid from circulating, so that the known parabolic formation of the surface of the liquid, due to the centrifugal action, is avoided. Moreover the mixing of the acid with the benzol is promoted thereby.

hat I claim as my invention and desire to secure by Let'ters Patent of the United States is 1. A mixing apparatus for purifying benzol by means of sulfuric acid, comprising a vessel, a mixing wheel contained therein and located at a substantial distance above the bottom of thevessel to be adapted to be clear of the acid settled at such bottom, and a stationary suction pipe, the mixing Wheel and suction pipe being separated by a small space.

2. A. mixing apparatus for purifying benzol by means of sulfuric acid comprising a vessel, a bracket and a bearing extending from the cover of said vessel into the interior thereof, a suction pipe depending from said bracket, and a mixing wheel journaled in the bearing, and located at a substantial distance above the bottom of the vessel, the suction pipe and mixing wheel being so arated by a small space.

IiEINRICH KOPPERS. [L.s.l

Witnesses:

ALBERT NUFER, Tos. Krvn. 

